The kill command attempts to terminate any process which keeps a sound
device busy. If you get the kill "usage" error then it just means there
were no such processes.
(Perhaps better written with xargs so you can avoid the spurious error
message:
lsof -t /dev/dsp* /dev/snd/* 2>/dev/null | xargs -r0 kill
... but I digress.)
The first modprobe attempts to unload any sound-related modules. If it
fails, the final modprobe will not be attempted.
(Better written witout a useless use of grep:
sudo modprobe -r $(lsmod | awk '/^snd/{print $1}') && sudo modprobe snd-
cs4231
... but I digress again.)
The final modprobe apparently attempts to load the cs4231 driver instead
of whatever you had before (snd-nm256 I imagine). The snd-cs4231-lib
module is different from snd-cs4231 proper, and will presumably be
loaded by modprobe already if you have a "top-level" module which
depends on it (as apparently nm256 does, too).
If the command succeeded and sound still doesn't work, please say so
here. If it didn't succeed, maybe you could try to blacklist the snd-
nm256 module temporarily -- see http://bugs.debian.org/426166 for some
sort of instructions.
(I have no knowledge of the NM2200, I stumbled over this bug while
searching for something else.)
--
Neomagic Corporation NM2200 - no sound
https://bugs.launchpad.net/bugs/82765
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